For the reaction

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

For the reaction CO(g)+Cl2(g)⇌COCl2(g)\text{CO}(g)+\text{Cl}_2(g)\rightleftharpoons\text{COCl}_2(g), Kc=1.5×104K_c = 1.5\times10^{4} at 800 K. A vessel initially contains [CO]=0.200 M[\text{CO}]=0.200\,\text{M}, [Cl2]=0.300 M[\text{Cl}_2]=0.300\,\text{M}, and no phosgene. Which value is closest to the equilibrium concentration of COCl2_2? (a) 3.0×10−1 M3.0\times10^{-1}\,\text{M} (b) 2.0×10−1 M2.0\times10^{-1}\,\text{M} (c) 1.0×10−1 M1.0\times10^{-1}\,\text{M} (d) 4.0×10−6 M4.0\times10^{-6}\,\text{M}

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